77421 divided by 4 
We're looking to find how many times 4 goes into 77421.

Moving on to step 1:
4 goes into 7 1 times with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 3 after subtracting 4 from 7.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 4

Step 2:
37 divided by 4 is 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 19.0
The remainder is 1 after subtracting 36 from 37.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 4

On to step 3:
4 can be fit into 14 3 times, resulting in a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 193.0
Subtract 12 from 14 to get 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 4

Advancing to step 4:
If we divide 22 by 4, we get 5 and a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 1935.0
Subtracting 20 from 22 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 4

Moving on to step 5:
4 can be fit into 21 5 times, resulting in a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 19355.0
Subtracting 20 from 21 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 6:
When dividing 10 by 4, we get 2 with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 19355.2
Subtract 8 from 10 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
4 can be fit into 20 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 19355.25
If we subtract 20 from 20, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
When dividing 0 by 4, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 19355.25
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
4 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 19355.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 19355.25 with a remainder of 0.0.